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FFmpeg/libavformat/wvdec.c

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/*
* WavPack demuxer
* Copyright (c) 2006,2011 Konstantin Shishkov
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/channel_layout.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/dict.h"
#include "avformat.h"
#include "internal.h"
#include "apetag.h"
#include "id3v1.h"
#include "wv.h"
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enum WV_FLAGS {
WV_MONO = 0x0004,
WV_HYBRID = 0x0008,
WV_JOINT = 0x0010,
WV_CROSSD = 0x0020,
WV_HSHAPE = 0x0040,
WV_FLOAT = 0x0080,
WV_INT32 = 0x0100,
WV_HBR = 0x0200,
WV_HBAL = 0x0400,
WV_MCINIT = 0x0800,
WV_MCEND = 0x1000,
WV_DSD = 0x80000000,
};
static const int wv_rates[16] = {
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6000, 8000, 9600, 11025, 12000, 16000, 22050, 24000,
32000, 44100, 48000, 64000, 88200, 96000, 192000, -1
};
typedef struct WVContext {
uint8_t block_header[WV_HEADER_SIZE];
WvHeader header;
int rate, chan, bpp;
uint32_t chmask;
int multichannel;
int block_parsed;
int64_t pos;
int64_t apetag_start;
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} WVContext;
static int wv_probe(const AVProbeData *p)
{
/* check file header */
if (p->buf_size <= 32)
return 0;
if (AV_RL32(&p->buf[0]) == MKTAG('w', 'v', 'p', 'k') &&
AV_RL32(&p->buf[4]) >= 24 &&
AV_RL32(&p->buf[4]) <= WV_BLOCK_LIMIT &&
AV_RL16(&p->buf[8]) >= 0x402 &&
AV_RL16(&p->buf[8]) <= 0x410)
return AVPROBE_SCORE_MAX;
else
return 0;
}
static int wv_read_block_header(AVFormatContext *ctx, AVIOContext *pb)
{
WVContext *wc = ctx->priv_data;
int ret;
int rate, bpp, chan;
uint32_t chmask, flags;
unsigned rate_x;
wc->pos = avio_tell(pb);
/* don't return bogus packets with the ape tag data */
if (wc->apetag_start && wc->pos >= wc->apetag_start)
return AVERROR_EOF;
ret = avio_read(pb, wc->block_header, WV_HEADER_SIZE);
if (ret != WV_HEADER_SIZE)
return (ret < 0) ? ret : AVERROR_EOF;
ret = ff_wv_parse_header(&wc->header, wc->block_header);
if (ret < 0) {
av_log(ctx, AV_LOG_ERROR, "Invalid block header.\n");
return ret;
}
if (wc->header.version < 0x402 || wc->header.version > 0x410) {
avpriv_report_missing_feature(ctx, "WV version 0x%03X",
wc->header.version);
return AVERROR_PATCHWELCOME;
}
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/* Blocks with zero samples don't contain actual audio information
* and should be ignored */
if (!wc->header.samples)
return 0;
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// parse flags
flags = wc->header.flags;
rate_x = (flags & WV_DSD) ? 4 : 1;
bpp = (flags & WV_DSD) ? 0 : ((flags & 3) + 1) << 3;
chan = 1 + !(flags & WV_MONO);
chmask = flags & WV_MONO ? AV_CH_LAYOUT_MONO : AV_CH_LAYOUT_STEREO;
rate = wv_rates[(flags >> 23) & 0xF];
wc->multichannel = !(wc->header.initial && wc->header.final);
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if (wc->multichannel) {
chan = wc->chan;
chmask = wc->chmask;
}
if ((rate == -1 || !chan || flags & WV_DSD) && !wc->block_parsed) {
int64_t block_end = avio_tell(pb) + wc->header.blocksize;
if (!(pb->seekable & AVIO_SEEKABLE_NORMAL)) {
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av_log(ctx, AV_LOG_ERROR,
"Cannot determine additional parameters\n");
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return AVERROR_INVALIDDATA;
}
while (avio_tell(pb) < block_end && !avio_feof(pb)) {
int id, size;
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id = avio_r8(pb);
size = (id & 0x80) ? avio_rl24(pb) : avio_r8(pb);
size <<= 1;
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if (id & 0x40)
size--;
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switch (id & 0x3F) {
case 0xD:
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if (size <= 1) {
av_log(ctx, AV_LOG_ERROR,
"Insufficient channel information\n");
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return AVERROR_INVALIDDATA;
}
chan = avio_r8(pb);
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switch (size - 2) {
case 0:
chmask = avio_r8(pb);
break;
case 1:
chmask = avio_rl16(pb);
break;
case 2:
chmask = avio_rl24(pb);
break;
case 3:
chmask = avio_rl32(pb);
break;
case 4:
avio_skip(pb, 1);
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chan |= (avio_r8(pb) & 0xF) << 8;
chan += 1;
chmask = avio_rl24(pb);
break;
case 5:
avio_skip(pb, 1);
chan |= (avio_r8(pb) & 0xF) << 8;
chan += 1;
chmask = avio_rl32(pb);
break;
default:
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av_log(ctx, AV_LOG_ERROR,
"Invalid channel info size %d\n", size);
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return AVERROR_INVALIDDATA;
}
break;
case 0xE:
if (size <= 1) {
av_log(ctx, AV_LOG_ERROR,
"Invalid DSD block\n");
return AVERROR_INVALIDDATA;
}
rate_x = 1U << (avio_r8(pb) & 0x1f);
if (size)
avio_skip(pb, size-1);
break;
case 0x27:
rate = avio_rl24(pb);
break;
default:
avio_skip(pb, size);
}
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if (id & 0x40)
avio_skip(pb, 1);
}
if (rate == -1 || rate * (uint64_t)rate_x >= INT_MAX) {
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av_log(ctx, AV_LOG_ERROR,
"Cannot determine custom sampling rate\n");
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return AVERROR_INVALIDDATA;
}
avio_seek(pb, block_end - wc->header.blocksize, SEEK_SET);
}
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if (!wc->bpp)
wc->bpp = bpp;
if (!wc->chan)
wc->chan = chan;
if (!wc->chmask)
wc->chmask = chmask;
if (!wc->rate)
wc->rate = rate * rate_x;
if (flags && bpp != wc->bpp) {
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av_log(ctx, AV_LOG_ERROR,
"Bits per sample differ, this block: %i, header block: %i\n",
bpp, wc->bpp);
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return AVERROR_INVALIDDATA;
}
if (flags && !wc->multichannel && chan != wc->chan) {
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av_log(ctx, AV_LOG_ERROR,
"Channels differ, this block: %i, header block: %i\n",
chan, wc->chan);
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return AVERROR_INVALIDDATA;
}
if (flags && rate != -1 && !(flags & WV_DSD) && rate * rate_x != wc->rate) {
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av_log(ctx, AV_LOG_ERROR,
"Sampling rate differ, this block: %i, header block: %i\n",
rate * rate_x, wc->rate);
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return AVERROR_INVALIDDATA;
}
return 0;
}
static int wv_read_header(AVFormatContext *s)
{
AVIOContext *pb = s->pb;
WVContext *wc = s->priv_data;
AVStream *st;
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int ret;
wc->block_parsed = 0;
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for (;;) {
if ((ret = wv_read_block_header(s, pb)) < 0)
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return ret;
if (!wc->header.samples)
avio_skip(pb, wc->header.blocksize);
else
break;
}
/* now we are ready: build format streams */
st = avformat_new_stream(s, NULL);
if (!st)
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return AVERROR(ENOMEM);
if ((ret = ff_alloc_extradata(st->codecpar, 2)) < 0)
return ret;
AV_WL16(st->codecpar->extradata, wc->header.version);
lavf: replace AVStream.codec with AVStream.codecpar Currently, AVStream contains an embedded AVCodecContext instance, which is used by demuxers to export stream parameters to the caller and by muxers to receive stream parameters from the caller. It is also used internally as the codec context that is passed to parsers. In addition, it is also widely used by the callers as the decoding (when demuxer) or encoding (when muxing) context, though this has been officially discouraged since Libav 11. There are multiple important problems with this approach: - the fields in AVCodecContext are in general one of * stream parameters * codec options * codec state However, it's not clear which ones are which. It is consequently unclear which fields are a demuxer allowed to set or a muxer allowed to read. This leads to erratic behaviour depending on whether decoding or encoding is being performed or not (and whether it uses the AVStream embedded codec context). - various synchronization issues arising from the fact that the same context is used by several different APIs (muxers/demuxers, parsers, bitstream filters and encoders/decoders) simultaneously, with there being no clear rules for who can modify what and the different processes being typically delayed with respect to each other. - avformat_find_stream_info() making it necessary to support opening and closing a single codec context multiple times, thus complicating the semantics of freeing various allocated objects in the codec context. Those problems are resolved by replacing the AVStream embedded codec context with a newly added AVCodecParameters instance, which stores only the stream parameters exported by the demuxers or read by the muxers.
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st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
st->codecpar->codec_id = AV_CODEC_ID_WAVPACK;
av_channel_layout_from_mask(&st->codecpar->ch_layout, wc->chmask);
lavf: replace AVStream.codec with AVStream.codecpar Currently, AVStream contains an embedded AVCodecContext instance, which is used by demuxers to export stream parameters to the caller and by muxers to receive stream parameters from the caller. It is also used internally as the codec context that is passed to parsers. In addition, it is also widely used by the callers as the decoding (when demuxer) or encoding (when muxing) context, though this has been officially discouraged since Libav 11. There are multiple important problems with this approach: - the fields in AVCodecContext are in general one of * stream parameters * codec options * codec state However, it's not clear which ones are which. It is consequently unclear which fields are a demuxer allowed to set or a muxer allowed to read. This leads to erratic behaviour depending on whether decoding or encoding is being performed or not (and whether it uses the AVStream embedded codec context). - various synchronization issues arising from the fact that the same context is used by several different APIs (muxers/demuxers, parsers, bitstream filters and encoders/decoders) simultaneously, with there being no clear rules for who can modify what and the different processes being typically delayed with respect to each other. - avformat_find_stream_info() making it necessary to support opening and closing a single codec context multiple times, thus complicating the semantics of freeing various allocated objects in the codec context. Those problems are resolved by replacing the AVStream embedded codec context with a newly added AVCodecParameters instance, which stores only the stream parameters exported by the demuxers or read by the muxers.
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st->codecpar->sample_rate = wc->rate;
st->codecpar->bits_per_coded_sample = wc->bpp;
avpriv_set_pts_info(st, 64, 1, wc->rate);
st->start_time = 0;
if (wc->header.total_samples != 0xFFFFFFFFu)
st->duration = wc->header.total_samples;
if (s->pb->seekable & AVIO_SEEKABLE_NORMAL) {
int64_t cur = avio_tell(s->pb);
wc->apetag_start = ff_ape_parse_tag(s);
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if (!av_dict_get(s->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX))
ff_id3v1_read(s);
avio_seek(s->pb, cur, SEEK_SET);
}
return 0;
}
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static int wv_read_packet(AVFormatContext *s, AVPacket *pkt)
{
WVContext *wc = s->priv_data;
int ret;
int off;
int64_t pos;
uint32_t block_samples;
if (avio_feof(s->pb))
return AVERROR_EOF;
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if (wc->block_parsed) {
if ((ret = wv_read_block_header(s, s->pb)) < 0)
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return ret;
}
pos = wc->pos;
if ((ret = av_new_packet(pkt, wc->header.blocksize + WV_HEADER_SIZE)) < 0)
return ret;
memcpy(pkt->data, wc->block_header, WV_HEADER_SIZE);
ret = avio_read(s->pb, pkt->data + WV_HEADER_SIZE, wc->header.blocksize);
if (ret != wc->header.blocksize) {
return AVERROR(EIO);
}
while (!(wc->header.flags & WV_FLAG_FINAL_BLOCK)) {
if ((ret = wv_read_block_header(s, s->pb)) < 0) {
return ret;
}
off = pkt->size;
if ((ret = av_grow_packet(pkt, WV_HEADER_SIZE + wc->header.blocksize)) < 0) {
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return ret;
}
memcpy(pkt->data + off, wc->block_header, WV_HEADER_SIZE);
ret = avio_read(s->pb, pkt->data + off + WV_HEADER_SIZE, wc->header.blocksize);
if (ret != wc->header.blocksize) {
return (ret < 0) ? ret : AVERROR_EOF;
}
}
pkt->stream_index = 0;
pkt->pos = pos;
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wc->block_parsed = 1;
pkt->pts = wc->header.block_idx;
block_samples = wc->header.samples;
if (block_samples > INT32_MAX)
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av_log(s, AV_LOG_WARNING,
"Too many samples in block: %"PRIu32"\n", block_samples);
else
pkt->duration = block_samples;
return 0;
}
const AVInputFormat ff_wv_demuxer = {
.name = "wv",
.long_name = NULL_IF_CONFIG_SMALL("WavPack"),
.priv_data_size = sizeof(WVContext),
.read_probe = wv_probe,
.read_header = wv_read_header,
.read_packet = wv_read_packet,
.flags = AVFMT_GENERIC_INDEX,
};